I-Spermatogenesis ne-oogenesis

I-spermatogenesis ne-oogenesis yizinqubo lapho ukubunjwa, ukukhula, nokuvuthwa kwamaseli wesilisa nabesilisa besifazane kwenzeka, ngokulandelana. Zombili lezi zenzakalo zinokufana okuningi okufanayo. Kodwa, naphezu kwalokhu, kukhona umehluko. Ake sibheke ngokucophelela izici ze-spermatogenesis ne-oogenesis futhi zibaphathe.

Ziyini ukufana kwe-oogenesis ne-spermatogenesis?

Okokuqala, kufanele kuqashelwe ukuthi kokubili ukucubungula idatha kunezigaba ezifanayo. Cabanga ngabo ngokulandelayo:

1. Isiteji sokukhiqiza. Ngalesi sigaba, amangqamuzana ayisisekelo e-spermatogonia kanye ne-oogonia aqala ukuhlukanisa ngokukhululekile ngama-mitosis. Kumele kuqashelwe lesi sici salesi sigaba: emadodeni, ukukhiqizwa kwamaseli ocansi kubonakala kuyo yonke impilo (kusukela ngesikhathi sokuvuthwa ), futhi kwabesifazane kule nqanaba kuqhubeka esiteji sokuthuthukiswa kwamabriyoni (izinyanga ezimbili ezinhlanu zokuthuthukiswa komntwana).
2. Isiteji sokukhula. Kukhona ukwanda okuqinile kwamaseli ocansi ngesayizi. Ngenxa yalokho, ziphenduka zibe izidakamizwa nama-oocyte we-oda lokuqala. Kulesi simo, i-oocyte inkulu ngobukhulu ngoba iqoqa izakhi eziningi ezidingekayo ekuthuthukiseni umbungu emva kokukhulelwa kwe-oocyte.
3. Isiteji sokuvuthwa. Eyaziwa ngokuhamba kwe-meiosis 1 ne-meiosis 2. Ngenxa yesigaba sokuqala, i-spermatocytes nama-oocyte afaka ama-oda amabili, futhi emva kwamaqanda wesibili avuthiwe kanye nezinsimu ze-spermatids. Kubalulekile ukusho ukuthi i-spermatocyte eyodwa ye-oda eli-1 ngemuva kokuhlukaniswa inikeza ama-spermatids angu-4, futhi i-oocyte ye-oda eli-1 kuphela iqanda elilodwa kanye nama-corpuscle angu-3 akhiwa.

Uyini umehluko ku-oogenesis ne-spermatogenesis?

Ukuveza isici sokuqhathanisa se-oogenesis ne-spermatogenesis, kubalulekile ukusho ukuthi umehluko omkhulu walezi zinqubo ukungabi khona kwe-ovogenesis kwezigaba ezine zokwakheka. Kuyinto kuphela izilwanyana ezenza ushintsho zibe spermatozoa. Ukwakhiwa kwala maseli ocansi kuqala kuphela lapho kuqala ukukhulelwa kwabafana.

Yonke imithetho engenhla ye-spermatogenesis ne-oogenesis inezincazelo zazo eziphilayo. Ngakho-ke, isibonelo, ukwehlukana okungalingani kwamaseli wesondo ngesikhathi se-oogenesis kukhuthaza ukwakhiwa kweqanda elilodwa kuphela elikhulu elinomsoco wezakhi.

Futhi, ukuthi i-spermatozoa yenziwa okuningi kakhulu ngenxa yokuthi uma iqanda lihlwanyelwa, i-sex male yesilisa eyodwa kuphela ifinyelela. Abanye bafa endleleni eya ku-ovum.

Sikunikeza umdwebo obonwayo wokuqonda kangcono izinqubo ze-spermatogenesis ne-oogenesis, lapho amaphuzu amakhulu ngamunye wabo aboniswa khona.